Making a slanted pane that is more than a simple square with translation
Here's my alternate approach you may try, that uses proportional editing (linear) and some scaling.
 

Select the very end vertices of the plane, enable the proportional editing (set its mode to Linear) and translate upwards.


With the transform orientation set to Normal select all the faces of the plane and press S and then Z twice (to transform along the normal Z coordinate).


BTW @Duarte Farrajota Ramos 's method involving curves works as well. Just add a curve and set its angle to fit your needs. Then give the plane a Curve Modifier with a curve as a target.